题目内容
下列【1】、【2】、【3】、【4】注释标注的哪行代码有错误?import java.io.*;public class Ex {public static void main(String args[]){File file = new File("welcome.txt");//【1】try{FileOutputStream fileOut = new FileOutputStream(file);ObjectOutputStream objectOut = new ObjectOutputStream(fileOut);//【2】objectOut.writeObject("你好");//【3】objectOut.close();FileInputStream fileIn = new FileInputStream(file);ObjectInputStream objectIn = new ObjectInputStream(fileIn);String str = objectIn.readObject();//【4】System.out.println(str);}catch(Exception exp){}}}
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